package com.rr.program._map;

import java.util.HashMap;

/**
 * map不put值，直接取值
 *
 * @author : RENBIAO
 * @createTime : 2021/8/4 20:01
 */
public class MapIsNull {

    public static void main(String[] args) {
        HashMap<String, String> map = new HashMap<String, String>();
        String s = map.get("1");
        System.out.println(s);
    }
}
